Could Strong Neodymium Magnets Affect St. Louis Motor Functionality?

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Discussion Overview

The discussion revolves around the functionality of a St. Louis Motor being built for an AP physics project. Participants explore potential issues related to the use of strong neodymium magnets and their effects on the motor's operation, including alignment and polarity switching.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant reports that their St. Louis Motor does not work despite following directions and testing for continuity, raising the question of whether the neodymium magnets are too strong.
  • Another participant asks for clarification on how the motor fails to operate, inquiring whether there is a strong magnetic pull or if the motor is simply inactive.
  • A participant notes that the motor aligns with the magnets but does not spin, suggesting that it should rotate by flipping the polarity of the electrical current.
  • Further inquiry is made about whether a push would cause the motor to flip 180 degrees on its own and whether misalignment of the brushes could be causing the issue, emphasizing the importance of timing in polarity switching.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the specific cause of the motor's failure to operate, with multiple potential explanations being discussed but no consensus reached on the correct diagnosis.

Contextual Notes

Participants have not fully explored the implications of using strong neodymium magnets, and there may be assumptions about the alignment and timing of the motor's components that remain unaddressed.

curly_ebhc
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I am building a St. Louis Motor for a project in my AP physics class. I followed the directions the best i could and my physics teacher said it looked good but it does not seem to work. I tested it for continuity and it looks good. My math teacher thought that maybe the neodymium magnets i am using are tooo strong and realign the domains in the nails inside the wire coils. What do you make of this . Should i use weaker magnets?

Thank you
 
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curly_ebhc said:
I am building a St. Louis Motor for a project in my AP physics class. I followed the directions the best i could and my physics teacher said it looked good but it does not seem to work. I tested it for continuity and it looks good. My math teacher thought that maybe the neodymium magnets i am using are tooo strong and realign the domains in the nails inside the wire coils. What do you make of this . Should i use weaker magnets?

Thank you

How does it not work? Is there strong pull? Or is it just limp? Is the problem that it's there's no activity (i.e. magnetic pull), or is it that there's plenty of activity but that it's not flipping to repulsion once the armature is aligned?
 
It alligns with the magnets but then does not spin. It seems like it would just spin fliping the polarity of the electrical current but it behaves exactly the same.
 
curly_ebhc said:
It alligns with the magnets but then does not spin. It seems like it would just spin fliping the polarity of the electrical current but it behaves exactly the same.

If you give it a push, will it flip 180 degrees on its own? Is it possible your brushes are misaligned? That's often the problem with these things - the polarity must switch at just the right moment - too soon or too late and you don't get the "follow-through".
 

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